A perfect blue dragon scale is one of the scales of the four Chromatic dragons that Vannaka can ask you to fetch him, as part of his Slayer challenge. Blue dragons and Baby blue dragons can drop this scale, but only when the player has taken the challenge. The scale is not a guaranteed drop, so the player should be prepared to slay several dragons to obtain one. Multiple scales can be obtained, but all are consumed when the challenge is completed.
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- ^ There is further information on this drop; see the associated page for details.
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- patch 27 November 2017 (Update):
- Perfect dragon scales (for Vannaka's Slayer challenge) no longer try and drop on non-member worlds.